Results 41 to 50 of about 21,104 (196)

Structure of the Turbulent Interplanetary Magnetic Field [PDF]

The Astrophysical Journal, 2006
We show that two widely used but apparently different models of the turbulent interplanetary magnetic field are closely related. One of these is the so-called quasi-static turbulence model, in which interplanetary magnetic field fluctuations are generated at a source surface near the Sun by random transverse plasma motions (such as supergranulation at ...
J. Giacalone, J. R. Jokipii, W. H. Matthaeus   +2 more
openaire   +1 more source

Instabilities Driven by Proton Temperature Anisotropy in the Presence of Alpha Particles: Implications for Proton-temperature-anisotropy Constraint in the Solar Wind

The Astrophysical Journal, 2023
In situ measurements reveal that proton temperature anisotropy is ubiquitous in the solar wind. Various plasma instabilities have been proposed to regulate the distribution of the proton temperature anisotropy in the solar wind; detailed constraint ...
L. Xiang, D. J. Wu, L. Chen, Q. H. Li, G. Q. Zhao, H. Q. Feng, H. W. Yu   +6 more
doaj   +1 more source

On the Origin of High–Frequency Magnetic Fluctuations in the Interplanetary Medium: A Brownian–like Approach

Frontiers in Physics, 2021
Low–frequency fluctuations in the interplanetary medium have been extensively investigated and described in the framework of turbulence, and the observed universal scaling behavior represents a clear signature of the underlying energy cascade.
Vincenzo Carbone, Vincenzo Carbone, Fabio Lepreti, Fabio Lepreti, Antonio Vecchio, Antonio Vecchio, Tommaso Alberti, Federica Chiappetta   +7 more
doaj   +1 more source

Proposed Resolution to the Solar Open Magnetic Flux Problem

The Astrophysical Journal
The solar magnetic fields emerging from the photosphere into the chromosphere and corona are comprised of a combination of closed (field lines with both ends rooted at the Sun) and open (field lines with only one end at the Sun) fields.
C. Nick Arge, Andrew Leisner, Spiro K. Antiochos, Samantha Wallace, Carl J. Henney   +4 more
doaj   +1 more source

Low-frequency Waves Due to Newborn Interstellar Pickup Ions Observed from 43 to 47 au by the Voyager 1 Spacecraft

The Astrophysical Journal, 2023
Interstellar neutral atoms enter the heliosphere at a relatively slow speed corresponding to the motion of the Sun through the local interstellar medium, which is approximately 25 km s ^−1 .
Lily A. Ercoline, Charles W. Smith, Matthew R. Argall, Colin J. Joyce, Philip A. Isenberg, Bernard J. Vasquez, Nathan A. Schwadron, Justyna M. Sokół, Leonard F. Burlaga   +8 more
doaj   +1 more source

Observations on a series of merging magnetic flux ropes within an interplanetary coronal mass ejection

, 2018
Coronal mass ejections (CMEs) are intense solar explosive eruptions. CMEs are highly important players in solar-terrestrial relationships, and they have important consequences for major geomagnetic storms and energetic particle events.
Feng, Hengqiang, Liu, Qiang, Wu, Dejin, Zhao, Guoqing, Zhao, Yan   +4 more
core   +1 more source

Effects of Waves on the Spectral Anisotropy of the Transition Range in Solar Wind Turbulence

The Astrophysical Journal
In the transition range of the solar wind turbulence, the magnetic spectrum has been observed to be strongly anisotropic with respect to the local mean field. However, the generation mechanism of the anisotropy remains not well understood.
Hua Zhang, Xin Wang, Haochen Yuan
doaj   +1 more source

Magnetic fields and flows between 1 AU and 0.3 AU during the primary mission of HELIOS 1 [PDF]

, 1978
The recurrent flow and field patterns observed by HELIOS 1, and the relation between these patterns and coronal holes are discussed. Four types of recurrent patterns were observed: a large recurrent stream, a recurrent slow (quiet) flow, a rapidly ...
Bavassano, B., Burlaga, L. F., Harvey, J., Mariani, F., Ness, N. F., Rosenbauer, H., Schwenn, R., Villante, U.   +7 more
core   +2 more sources

Synoptic Maps of Solar Magnetic Field and Open Magnetic Flux

The Astrophysical Journal
The interplanetary magnetic field (IMF) measured near Earth can be up to 2 times greater than that derived from models using remote solar observations.
Yang Liu, C. Nick Arge, Shaela I. Jones, Andrew Leisner, Ruizhu Chen, J. Todd Hoeksema   +5 more
doaj   +1 more source

Scaling Anisotropy with Stationary Background Field in Near-Sun Solar Wind Turbulence

The Astrophysical Journal, 2023
The scaling of magnetic fluctuations provides crucial information for the understanding of solar wind turbulence. However, the observed magnetic fluctuations contain not only turbulence but also magnetic structures, leading to the violation of time ...
Honghong Wu, Jiansen He, Shiyong Huang, Liping Yang, Xin Wang, Zhigang Yuan   +5 more
doaj   +1 more source